Detective Sergeant Peter Grant takes a much-needed holiday up in Scotland. And he'll need one when this is over. If more's the merrier, then it's ecstatic as his partner Beverley, their young twins, his mum, dad, his dad's band and their dodgy manager all tag along. Even his boss, DCI Thomas Nightingale, takes in the coastal airs as he trains Peter's cousin Abigail in the arcane arts.